eric6/E5Gui/E5OverrideCursor.py

Sat, 10 Oct 2020 12:20:51 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Sat, 10 Oct 2020 12:20:51 +0200
changeset 7771
787a6b3f8c9f
child 7774
9eed155411f0
permissions
-rw-r--r--

Optimized the use of Waiting Cursors by using a specialized context manager class.

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2020 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5
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6 """
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7 Module implementing a context manager class for an override cursor and a
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8 QProcess class controlling an override cursor.
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9 """
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10
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11 import contextlib
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12
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13 from PyQt5.QtCore import pyqtSlot, Qt, QProcess, QEventLoop
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14 from PyQt5.QtGui import QCursor, QGuiApplication
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15
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16
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17 # TODO: add similar class for QMutexLocker
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18 class E5OverrideCursor(contextlib.AbstractContextManager):
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19 """
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20 Class implementing a context manager class for an override cursor.
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21 """
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22 def __init__(self, cursorShape=Qt.WaitCursor):
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23 """
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24 Constructor
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25
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26 @param cursorShape shape of the override cursor
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27 @type Qt.CursorShape
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28 """
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29 self.__cursorShape = cursorShape
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30
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31 def __enter__(self):
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32 """
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33 Special method called when entering the runtime ccontext.
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34
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35 @return reference to the context manager object
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36 @rtype E5OverrideCursor
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37 """
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38 QGuiApplication.setOverrideCursor(QCursor(self.__cursorShape))
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39 QGuiApplication.processEvents(QEventLoop.ExcludeUserInputEvents)
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40
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41 return self
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42
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43 def __exit__(self, exc_type, exc_value, traceback):
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44 """
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45 Special method called when exiting the runtime ccontext.
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46
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47 @param exc_type type of an exception raised in the runtime context
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48 @param exc_value value of an exception raised in the runtime context
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49 @param traceback traceback of an exception raised in the runtime
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50 context
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51 @return always returns None to not suppress any exception
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52 @rtype None
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53 """
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54 QGuiApplication.restoreOverrideCursor()
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55 QGuiApplication.processEvents(QEventLoop.ExcludeUserInputEvents)
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56
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57 return None
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58
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59
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60 class E5OverridenCursor(contextlib.AbstractContextManager):
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61 """
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62 Class implementing a context manager class for an overriden cursor.
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63
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64 The cursor is reset upon entering the runtime context and restored
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65 upon exiting it.
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66 """
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67 def __init__(self):
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68 """
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69 Constructor
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70 """
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71 self.__cursor = None
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72
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73 def __enter__(self):
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74 """
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75 Special method called when entering the runtime ccontext.
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76
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77 @return reference to the context manager object
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78 @rtype E5OverrideCursor
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79 """
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80 self.__cursor = QGuiApplication.overrideCursor()
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81 if self.__cursor is not None:
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82 QGuiApplication.restoreOverrideCursor()
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83 QGuiApplication.processEvents(QEventLoop.ExcludeUserInputEvents)
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84
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85 return self
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86
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87 def __exit__(self, exc_type, exc_value, traceback):
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88 """
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89 Special method called when exiting the runtime ccontext.
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90
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91 @param exc_type type of an exception raised in the runtime context
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92 @param exc_value value of an exception raised in the runtime context
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93 @param traceback traceback of an exception raised in the runtime
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94 context
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95 @return always returns None to not suppress any exception
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96 @rtype None
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97 """
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98 if self.__cursor is not None:
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99 QGuiApplication.setOverrideCursor(self.__cursor)
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100 QGuiApplication.processEvents(QEventLoop.ExcludeUserInputEvents)
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101
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102 return None
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103
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104
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105 class E5OverrideCursorProcess(QProcess):
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106 """
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107 Class implementing a QProcess subclass controlling an override cursor.
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108 """
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109 def __init__(self, parent=None, cursorShape=Qt.WaitCursor):
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110 """
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111 Constructor
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112
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113 @param parent reference to the parent object
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114 @type QObject
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115 @param cursorShape shape of the override cursor
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116 @type Qt.CursorShape
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117 """
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118 super(E5OverrideCursorProcess, self).__init__(parent)
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119
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120 self.__cursorShape = cursorShape
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121
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122 self.started.connect(self.__processStarted)
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123 self.finished.connect(self.__processFinished)
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124
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125 @pyqtSlot()
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126 def __processStarted(self):
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127 """
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128 Private slot setting the cursor after the process has started.
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129 """
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130 QGuiApplication.setOverrideCursor(QCursor(self.__cursorShape))
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131 QGuiApplication.processEvents(QEventLoop.ExcludeUserInputEvents)
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132
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133 @pyqtSlot()
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134 def __processFinished(self):
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135 """
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136 Private slot resetting the cursor when the process finished.
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Detlev Offenbach <detlev@die-offenbachs.de>
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137 """
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138 QGuiApplication.restoreOverrideCursor()
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139 QGuiApplication.processEvents(QEventLoop.ExcludeUserInputEvents)

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